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John Deere Tractors Discussion Forum
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JD 2520 Injector problems

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Alan Schwartz

12-18-2003 06:12:56




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I replaced the injectors on my JD 2520 and can't start the tractor. I have bled the system so that fuel gets to the injector pump. Sometimes,I get fuel out of one injector nozzle. Is the system still air bound or is the injector pump bad? Any information will be greatly appreciated.




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WTW

12-18-2003 06:26:00




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 Re: JD 2520 Injector problems in reply to Alan Schwartz, 12-18-2003 06:12:56  
Alan, Why did you replace the injectors was it because the tractor would not start or other reasons? You may want to remove the timing window plug located at the base of the injection pump and watch while cranking engine to see if pump is turning.



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Rodney A. Johnson

12-18-2003 08:24:54




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 Re: Re: JD 2520 Injector problems in reply to WTW, 12-18-2003 06:26:00  
You mentioned that you bled the injector pump, did you also bleed the lines from the pump to the injectors?

When I had my injectors rebuilt for the 3010D, I followed the JD service manual which had you leave the lines loose to the injectors until diesel fuel came out at each of the injectors (I don't have the pencil style..have the bosch ones...I think that is the correct name). Then tighten and start. If there was still some problems with uneven running, you needed to loosen one line at a time to see if you could get the remaining air out of any of the lines (did this while it was running).

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G-MAN

12-18-2003 09:59:06




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 Re: Re: Re: JD 2520 Injector problems in reply to Rodney A. Johnson, 12-18-2003 08:24:54  
Usually, if you have fuel to the pump and delivery valves, it's not necessary to go to the extra trouble to crack the lines at the nozzles. Most times, they'll go ahead and purge the air out and run by themselves. It may take just a little more cranking, but nine times out of ten, they will take off and run without bleeding the high pressure lines, and any cylinder that is missing will straighten out. I do a bunch of engine work, and rarely bleed the lines at the nozzles. It also saves a bunch of mess if you can get by without bleeding the lines at the nozzles.

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Rodney A. Johnson

12-19-2003 12:13:17




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 Re: Re: Re: Re: JD 2520 Injector problems in reply to G-MAN, 12-18-2003 09:59:06  
I guess that makes sense. I hadn't done it before, and was just following the book. Didn't really think too deeply about it. Plus I don't like cranking starters for very long.



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